
SMA Technologie AG Retrofitting the Communication Interfaces
Short Description PB-NR-IXX073014 Page 25
Wiring of an inverter with RS485 at a PC
GND
DATA+
max. 50
inverter on
RS485 bus
Connect shield
to case
Connect shield
to case
10-pin terminal
on the interface
converter I-7520
D-SUB 9 socket on
the interface converter
I-7520
PC running
Sunny Data Control
+10V ... 30V DC
Interface Converter
RS485 / RS232
I-7520
9
1
2
3
5
2
DATA-
10
7
5
7
5
2
2
3
5
2
iYCY twisted pair cable
iYCY twisted pair cable
External
Power Supply
Betri
e
b
O
p
eratio
n
E
r
ds
ch
luss
E
a
rth
F
ault
S
törung
F
ailure
Ph
o
to
vo
ltaik-
S
tring
w
echsel
r
ichter
P
hotov
o
ltaic
s
trin
g
i
n
verter
Betrieb
Operation
Erdschluss
Earth
F
ault
Störung
Failure
Photovoltaik-Stringwechselrichter
Photovoltaic
s
tring
i
nverter
The last inverter on the
RS485 bus must be terminated.
This is done by mounting jumper
"A" on the system control board,
or by installing a 120 Ohm resistor
between connector "2" and
connector "7".
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